Fixing device for catalyzer particles

Abstract

With the help of a fixing device for catalyzer particles, wherein the catalyzer particles are packed in a bed which can be passed through by a gas flow in the direction of gravity, it is intended to achieve a minimum specific pressure loss which will remain low even if dirt should arise from the operating process; a fixing device which has a minimum influence on the period of presence of the gas flowing through; which ensures the reliable hold-down of the catalyzer particles even at high approach velocities; and which is flexible to a certain degree in order to adapt to bed changes. This is achieved by placing at least one layer of a metal braiding on the packed bed of the catalyzer particles, and the metal braiding consisting of individual metal braiding elements which are firmly braided together.

1. A fixing device for catalyzer particles, wherein the catalyzer particles are provided by a packed bed through which a gas can flow in the direction of gravity,
 wherein at least one layer of a metal braiding is placed on top of the bed of catalyzer particles, the metal braiding consisting of individual metal braiding elements which are braided together, wherein the metal braiding is designed so that a maximum possible free cross-section of the metal braiding element is smaller than the smallest cross-section of the catalyzer particles, and wherein the individual metal braiding elements are in a closed pattern and wherein the metal braiding elements are of a ring-shaped design. 
 
     
     
       2. The fixing device according to  claim 1 , wherein the metal braiding elements are of an oval shaped design. 
     
     
       3. A fixing device according to  claim 1 , wherein each of the metal braiding elements is firmly closed and/or welded. 
     
     
       4. A fixing device according to  claim 1 , wherein the size of the surface area of the metal braiding is larger than the surface area of the bed of catalyzer particles. 
     
     
       5. A fixing device according to  claim 4 , wherein the size of the area of the metal braiding is 1.05 to 2 times the size of the surface area of the bed of catalyzer particles. 
     
     
       6. A fixing device according to  claim 1 , wherein at least one other layer of a metal braiding is placed on top of the first layer of metal braiding. 
     
     
       7. A fixing device according to  claim 6 , wherein a maximum possible free cross-section of the metal braiding elements of the additional metal braiding layer is smaller than the maximum possible free cross-section of the metal braiding elements of the first layer of metal braiding. 
     
     
       8. A fixing device according to  claim 1 , wherein the at least one layer of metal braiding is made of several segments which are linked together. 
     
     
       9. A fixing device according to  claim 8 , wherein the segments are mainly linked at their seams in abutting relationship and/or they partially overlap at their seams. 
     
     
       10. A fixing device according to  claim 1 , wherein the metal braiding is made from a catalytically active material and/or coated with a catalytically active material. 
     
     
       11. A fixing device according to  claim 1 , wherein the metal braiding is made from an anticorrosion material and/or provided with anticorrosion protection. 
     
     
       12. A fixing device according to  claim 1 , wherein the fixing device is configured to fit in an oxy reactor for the dehydration of butane and/or propane. 
     
     
       13. A method for holding down catalyzer particles with a fixing device according to  claim 1 , wherein at least one layer of metal braiding is placed on top of the catalyzer particle bed in order to fix the catalyzer particles in the bed. 
     
     
       14. A reactor for gas phase reactions with a catalyzer, consisting of catalyzer particles in a packed bed, wherein the catalyzer particles are fixed with a fixing device comprising:
 a packed bed of catalyzer particles through which a gas can flow in the direction of gravity, 
 at least one layer of a metal braiding is placed on top of the bed of catalyzer particles, the metal braiding comprising individual metal braiding elements which are braided together, wherein the metal braiding is designed so that a maximum possible free cross-section of the metal braiding element is smaller than the smallest cross-section of the catalyzer particles, and wherein the individual metal braiding elements are in a closed pattern and wherein the metal braiding elements are of a ring-shaped design with at least one metal braiding element comprising an oval. 
 
     
     
       15. A fixing device according to  claim 6 , wherein a maximum possible free cross-section of the metal braiding elements of the additional metal braiding layer is not smaller-than the maximum possible free cross-section of the metal braiding elements of the first layer of metal braiding.